In the absence of a proportional voting system, in the UK, the voters with real power to choose the government are those who live in marginal constituencies, and these are who the main parties and media focus on.

10.15am David Cameron and Boris Johnson at campaign event in West London

10.30am Gordon Brown speech at Labour campaign event

Gordon Brown's battle bus begins to make its way around the country

Nick Clegg returns to his constituency of Sheffield Hallam

David Cameron will visit a business in Aberdeen.

Brown will use a speech this evening on economy to reject claims that the bulk of tax rises could be avouded by 'efficiencies'.

Most MPs back in their constituencies after Parliament prorogued yesterday

You can follow the party leaders around the country today and see how narrow their focus is on a small number of 'marginal' constituencies, with the Electoral Reform Society: http://www.ekklesia.co.uk/node/11752

A few weeks ago I argued on BBC1’s Big Questions for a ‘maximum wage’ – a link between the lowest paid workers and the highest paid, to tackle inequality. The idea has been proposed by the New Economics Foundation.

The row over the proposed National Insurance increase has continued today, which some are interpreting as small change. It is true that £6 billion isn’t very much compared to the overall annual Government budget of hundreds of billions.

What has become lost in the row - and is symptomatic of a much wider problem with many election issues - is that this is about people’s lives. To put things in a different perspective, £6 billion is also what it costs to employ 300,000 people a year on £20,000.

The Electoral Reform Society (ERS) have produced a fantastic tool which will highlight how the big party leaders will be spending their time this election - targeting a very small number of marginal seats. It will be very revealing about where their values lie.

The Tories brought out Michael Caine to their press conference this morning alongside David Cameron, which raises serious questions about the extent to which they believe 'we are all in this together'.

What message does this send? As well as showing how willing some parties are to embrace the cult of celebrity, it also shows how Cameron (and Caine) are reluctant to tackle the issue of growing inequality. This seems to be more about the 'Self-Preservation Society' than the 'Big Society'.